PDF malware analysis — malicious · c55b9a9c5fc1280e

MALICIOUS

PDF

84.3 KB Created: 2021-04-10 04:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22

MD5: a53b30b3ba404d3bcff215916fbe1f83 SHA-1: 297188df07530e64e3b4375be2e092d2a1f22f0b SHA-256: c55b9a9c5fc1280e77c7a7490abeefb31948e7db5847c77599a5f8aef3862379

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains text related to astrological signs, which is likely a lure to entice users to click on the embedded malicious URLs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://bologen.ru/strik?utm_term=how+do+i+find+out+if+my+star+sign+has+changed PDF link annotation
- https://static.s123-cdn-static.com/uploads/4383165/normal_5ffcd819dbab5.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4389352/normal_6066f5d18cc6d.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4424011/normal_5fe3aeb5bb83c.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4474992/normal_604fb11b6b695.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4499995/normal_602caa475ce52.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4464315/normal_5fcbd127f36d6.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4404753/normal_6023a8cd0c5e0.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4377902/normal_5fe7af7019ea9.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4455673/normal_6064e7a84b614.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- http://jutoxuriwiloja.epizy.com/cavatina_guitar_tabs.pdfIn PDF document text
- https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_18a9a4b8c1bf4c1f8b687a982a7be8f2.pdf?index=trueIn PDF document text
- http://mirokuf.rf.gd/62010082777.pdfIn PDF document text
- http://segudufarus.epizy.com/23078588410.pdfIn PDF document text
- http://xigilozixorod.epizy.com/command_prompt_for_java.pdfIn PDF document text
- https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_205cbd33485b4075a9755ae3ef6ac010.pdf?index=trueIn PDF document text
- https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_9cabe73ae0ca4ddcac02e08a056d11ce.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/bidemewufa/a_death_in_the_family_batman.pdfIn PDF document text
- https://s3.amazonaws.com/vudivuzakal/38145410676.pdfIn PDF document text
- https://s3.amazonaws.com/jezekemunidup/android_studio_anim_xml.pdfIn PDF document text
- https://s3.amazonaws.com/xuvamuba/tewesodupe.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000fda4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDA4	5440 bytes
SHA-256: `e248a4719c273ae2dc0113eed2ac869c126465952d04d0015db1adf115b82548`
`font_01_sfnt_off00011004.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11004	11008 bytes
SHA-256: `f700e8bbe6d2e6fc0836cc0bdcc80a13ce3a370d9af610b2fdb862488bdd9049`
`font_02_sfnt_off00013547.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13547	4324 bytes
SHA-256: `05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176`

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